Select cover image from images in metadata.

[Borewit]

Add selectCover() function which helps to pick the best cover image.

import * as mm from 'music-metadata';

(async () => {
  const {common} = await mm.parseFile(filePath);
  const cover = mm.selectCover(common.picture);
}
)();

[coveralls]

Coverage decreased (-0.08%) to 92.359% when pulling ba404bb on selectCover into 73115d6 on master.

[Borewit]

Part of v7.2.0